# std::experimental::all_of, std::experimental::any_of, std::experimental::none_of, std::experimental::some_of

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< cpp‎ | experimental‎ | simd

Defined in header `<experimental/simd>` |  |
template< class T, class Abi > bool all_of( const simd_mask<T, Abi>& k ); | (1) | (parallelism TS v2)
template< class T, class Abi > bool any_of( const simd_mask<T, Abi>& k ); | (2) | (parallelism TS v2)
template< class T, class Abi > bool none_of( const simd_mask<T, Abi>& k ); | (3) | (parallelism TS v2)
template< class T, class Abi > bool some_of( const simd_mask<T, Abi>& k ); | (4) | (parallelism TS v2)

1) Returns true if all values in k are true.
2) Returns true if at least one value in k is true.
3) Returns true if all values in k are false.
4) Returns true if at least one value in k is true but not all values in k are true.

### Parameters

k | - | the `simd_mask` to apply the reduction to

### Return value

The boolean result of the horizontal reduction.

### Example

Run this code

    #include <cassert>
    #include <experimental/simd>

    namespace stq = std::experimental;

    int main()
    {
        using mask = stq::fixed_size_simd_mask<int, 4>;

        mask mask1{false}; // = {0, 0, 0, 0}
        assert
        (
            stq::none_of(mask1) == true &&
            stq::any_of(mask1) == false &&
            stq::some_of(mask1) == false &&
            stq::all_of(mask1) == false
        );

        mask mask2{true}; // = {1, 1, 1, 1}
        assert
        (
            stq::none_of(mask2) == false &&
            stq::any_of(mask2) == true &&
            stq::some_of(mask2) == false &&
            stq::all_of(mask2) == true
        );

        mask mask3{true};
        mask3[0] = mask3[1] = false; // mask3 = {0, 0, 1, 1}
        assert
        (
            stq::none_of(mask3) == false &&
            stq::any_of(mask3) == true &&
            stq::some_of(mask3) == true &&
            stq::all_of(mask3) == false
        );
    }

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